![]() Paul you're right Stewmac only list two types of mando knobs but the "Vintage-style Tuner Knobs" I linked to in the original post I think would just about work on a mandolin. Modern plastics are much less dangerous, but still will burn under direct flame. That is one reason why celluloid is rarely used these days. My only concern would be avoiding open flame while removing them. ![]() To remove the old ones I simply used a pair of pliars to crush the old knobs and they came off pretty easily. The early celluloid knobs are very flamable. It is all kind of trial and error but you should be able to get a good fit. An alternative method would be to use a Dremmel to grind the hole bigger, if necessary, so the knob simply slids on but use epoxy to act as glue and to fill any gaps which might remain. ![]() the replacement tuner knobs already have a hole in them for the shaft. The heat will assist in softening the plastic so that it will fit. With the tuners off the instrument you heat the metal shaft and while hot you force the button onto the shaft. I am fairly certain that you will be able to use the replacement knobs. The good news is that you can probably come fairly close to the color and maybe shape from mandolin parts suppliers such as Stewart MacDonald, which sells replacement tuner knobs. It is rare to find them in perfect condition now. Your tuner buttons are an early form of plastic (celluloid) which tends to disintigrate with age. ![]() Any cheap-ish solution to allowing the pegs to be turned would be fine - I even considered buying some plastic beads from an arts and crafts supplier and heating the ends of the posts to melt them into place, but I think that could end up very messy without knowing what type of plastic the beads are made from! Though possibly the ebony ones (3/32 diameter) could just be forced on and glued?Īny other suggestions? The mandolin is old but seems to have a straight neck so worth getting into playable condition again (needs a vellum too but that's another project). That would seem to rule out these vintage buttons from Stewmac Vintage-style Tuner Knobs () as their rectangular ones have a 5/32nds long edge. The post on which the button is seated has a rectangular end, measuring by eye I'd say the longest edge of the rectangle is 3 or 4/32nds. Hi - I have acquired an old mandolin banjo which has some missing tuner knobs and the ones that are on it are crumbling, so looking for advice on sourcing and replacing all of them. ![]()
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